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This paper discusses the real-time implementation of a high-quality audio codec at a bit rate below 150 kbit/s per monophonic channel on a 24-bit fixed-point DSP (Motorola DSP56002) based hardware. The algorithm is an adaptive modified discrete cosine transform coding technique. Known human hearing characteristics are exploited in the adaptive bit allocation scheme. Both the hardware and software configurations are described, along with measured execution times and program and data memory usages. A high fidelity quality suitable for consumer applications has been achieved. > |
